High Quality Content by WIKIPEDIA articles! In computer architecture, cycles per instruction (aka clock cycles per instruction, clocks per instruction, or CPI) is a term used to describe one aspect of a processor's performance: the number of clock cycles that happen when an instruction is being executed. It is the multiplicative inverse of instructions per cycle.Each stage requires one clock cycle and an instruction passes through the stages sequentially. Without pipelining, a new instruction is fetched in stage 1 only after the previous instruction finishes at stage 5. Therefore without pipelining the number of cycles it takes to execute an instruction is 5. This is the definition of CPI.

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